linux-kernel - Re: [PATCH v2 2/5] dt-bindings: mmc: sdhci-msm: constrain reg-names perp variants

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Message-ID: <CAD=FV=WUCPzzZHAPqoz-vhmcVxzYDxkKQs=+1tLZvsQjWe4q3Q@mail.gmail.com>
Date:   Mon, 11 Jul 2022 07:52:03 -0700
From:   Doug Anderson <dianders@...omium.org>
To:     Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
Cc:     Ulf Hansson <ulf.hansson@...aro.org>,
        Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Andy Gross <agross@...nel.org>,
        Bjorn Andersson <bjorn.andersson@...aro.org>,
        Konrad Dybcio <konrad.dybcio@...ainline.org>,
        Bhupesh Sharma <bhupesh.sharma@...aro.org>,
        Linux MMC List <linux-mmc@...r.kernel.org>,
        "open list:OPEN FIRMWARE AND FLATTENED DEVICE TREE BINDINGS" 
        <devicetree@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>
Subject: Re: [PATCH v2 2/5] dt-bindings: mmc: sdhci-msm: constrain reg-names
 perp variants

Hi

On Mon, Jul 11, 2022 at 1:29 AM Krzysztof Kozlowski
<krzysztof.kozlowski@...aro.org> wrote:
>
> The entries in arrays must have fixed order, so the bindings and Linux
> driver expecting various combinations of 'reg' addresses was never
> actually conforming to guidelines.
>
> The 'core' reg entry is valid only for SDCC v4 and lower, so disallow it
> in SDCC v5.  SDCC v4 supports CQE and ICE, so allow them, even though
> the qcom,sdhci-msm-v4 compatible is used also for earlier SoCs with SDCC
> v2 or v3, so it is not entirely accurate.
>
> Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>
>
> ---
>
> Changes since v1:
> 1. Rework the patch based on Doug's feedback.
> ---
>  .../devicetree/bindings/mmc/sdhci-msm.yaml    | 61 ++++++++++++-------
>  1 file changed, 38 insertions(+), 23 deletions(-)

In the ${SUBJECT} I'm not sure what a "perp variant" is. Is that a
typo or just a phrase I'm not aware of?


> diff --git a/Documentation/devicetree/bindings/mmc/sdhci-msm.yaml b/Documentation/devicetree/bindings/mmc/sdhci-msm.yaml
> index fc6e5221985a..2f0fdd65e908 100644
> --- a/Documentation/devicetree/bindings/mmc/sdhci-msm.yaml
> +++ b/Documentation/devicetree/bindings/mmc/sdhci-msm.yaml
> @@ -49,33 +49,11 @@ properties:
>
>    reg:
>      minItems: 1
> -    items:
> -      - description: Host controller register map
> -      - description: SD Core register map
> -      - description: CQE register map
> -      - description: Inline Crypto Engine register map
> +    maxItems: 4
>
>    reg-names:
>      minItems: 1
>      maxItems: 4
> -    oneOf:
> -      - items:
> -          - const: hc
> -      - items:
> -          - const: hc
> -          - const: core
> -      - items:
> -          - const: hc
> -          - const: cqhci
> -      - items:
> -          - const: hc
> -          - const: cqhci
> -          - const: ice
> -      - items:
> -          - const: hc
> -          - const: core
> -          - const: cqhci
> -          - const: ice
>
>    clocks:
>      minItems: 3
> @@ -177,6 +155,43 @@ required:
>  allOf:
>    - $ref: mmc-controller.yaml#
>
> +  - if:
> +      properties:
> +        compatible:
> +          contains:
> +            enum:
> +              - qcom,sdhci-msm-v4
> +    then:
> +      properties:
> +        reg:
> +          minItems: 2
> +          items:
> +            - description: Host controller register map
> +            - description: SD Core register map
> +            - description: CQE register map
> +            - description: Inline Crypto Engine register map
> +        reg-names:
> +          minItems: 2
> +          items:
> +            - const: hc
> +            - const: core
> +            - const: cqhci
> +            - const: ice
> +    else:
> +      properties:
> +        reg:
> +          minItems: 1
> +          items:
> +            - description: Host controller register map
> +            - description: CQE register map
> +            - description: Inline Crypto Engine register map
> +        reg-names:
> +          minItems: 1
> +          items:
> +            - const: hc
> +            - const: cqhci
> +            - const: ice

Do you need to set "maxItems" here? If you don't then will it inherit
the maxItems of 4 from above?

-Doug